Charles e



(No Model.) 2 Sheets-Sheet 1.

G. E. SORIBNER. REGULATOR FOR DYN'AMO ELECTRIC MACHINES.

No. 522,275. Patented July 3, 1894.

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coil, another field magnet in shunt of the main circuit in position tocreate electro-motive forces in each set of active coils, a constant anda variable field magnet terminating in a single pole piece presented tothe armature, said pole piece being increased in magnetic resistance ona line between the two magnets, substantially as described.

In witness whereof I hereunto subscribe my name this 16th day of May, A.D. 1889.

CHARLES E. SCRIBNER.

Witnesses:

ELLA EDLER, GEORGE P. BARTON.

UNITED STATES PATENT ()FFICE.

CHARLES E. SCRIBNER, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE WESTERNELECTRIC COMPANY, OF SAME PLACE.

REGULATOR FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 522,275, dated July 3,1894.

APPHCMiO11 filed October 14, 1889. Renewed December '7, 1893- Serial No.492,988. (No model.)

To all whom it may concern.-

Be it known that 1, CHARLES E. SCRIBNER, a citizen of the United States,residing at Chi-' cago, in the county of Cook and State of Illino1s,have invented a certain new and useful Improvement in Regulators for Dynamo-Eleclric Machines, (Case No. 208,) of which the following is afull, clear, concise, and exact description, reference being had to theaccompa- IO nying drawings, forming a part of this specification.

My invention relates to regulators for dynamo electric machines, wherebythe brushes are automatically shifted from time to time 15 to maintain apractically uniform current strength notwithstandingvariations in there-' sistance of the current. Heretofore various devices have been usedfor this purpose with good results.

The object of my invention is to provide means for doing this work whichshall be simple in construction, durable, and efficient in operation.

My invention consists in the combination 2 5 with a dash pot connectedwith the brush carrier and weighted or adjusted to tend to move thebrushes in a given direction, of an electric motor included in orconnected with main circuit and adapted to cause an arm or lug in itsrotation to engage with or take the frictional surface of a segmentprovided upon the brush carrier at each revolution of said arm or lug,thus moving the brush carrier forward, as it were, step by step inopposition to the 3 5 movement thereof caused by the weighted piston orcounter-balance of the dash pot.

My invention will be readily understood by reference to the accompanyingdrawings, in which-- Figure 1 is an elevation illustrative of myregulator applied to a dynamo electric machine. Fig. 2 is an elevationshowing the regulator connected with the brush carrier, together with adiagram of the circuits.

Like parts are indicated by similar letters of reference in both thefigures.

The dash pot, as shown most clearly in Fig. 2, has its piston rod topivoted to an arm or extension of the brush carrier 1), this pistonbeing weighted as shown, the amount of weight being adjustable. Themotor 0 is placed in the main circuit and upon its revolving shaft iscarried the arm or striker d. Upon the brush carrier or connectedtherewith is provided the bearing piece 6 against the un- 5 der convexsurface of which the striker cl is brought at each revolution. Everytime the striker thus takes the bearing surface the brush carrier isrotated ashort distance against the force of the weight of the dash potpiston. The position which the brush carrier will occupy depends,therefore, upon the amount of weight on one side and the frequency ofstrikes on the other side. The weight is initially adjusted to thenormal current of the machine and then the position of the brushcarrier, and hence of the brushes upon the commutator, will depend uponthe speed of rotation of the motor, that is the greater the number ofblows of the strikerthe greater will be the force opposed to thecounter-balance weight of the brush carrier, and hence the brush carrierwill be moved to adjust the brushes forward upon the commutator todecrease the voltage. Now as lamps are cut in or out of the circuits,the resistance thereof is increased or diminished as the case may be.Thus the rate of revolution of the motor is changed and the brushes areaccordingly shifted forward or backward upon the com mutator to maintainthe current strength.

The armature of the motor should be pro* vided with only a moderatenumber of ampere turns so that the motor will not become saturated butwill always readily respond to 8 5 changes in current strength, whetherabove or below the normal or predetermined strength.

My invention admits of various modifications that would readily suggestthemselves to those skilled in the art, and I, therefore, do 0 not limitmyself to the construction shown.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. The combination with the brush carrier 5 and thebrushes mounted thereon and resting on the commutator of a dynamoelectric machine, of a counter-balance weight and dash pot tending tomove the brush carrier in one direction, and a motor connected with thecir- 10o cuit of the machine and acting intermittingly upon the brushcarrier with greater or less

